How to make freestyle look hand drawn?
As far as I know, Freestyle doesn't stylize shading, only affects geometry lines (correct me if I am wrong). You can combine Freestyle lines in compositor with shading converted to strokes.

Basic plan for shading is to separate simple material to shading layers, and assign "stroke" textures with different density/color/orientation in according with these shading layers.

You can separate shading to layers inside materials using ColorRamp node. (Pic is not mine, taken from tutorial)



Also check .Blend file example on Blender site here (Blue Pencil Shark at the bottom of the page)